<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title></title>
	</head>
	<body>
		<script type="text/javascript">
			var s1 = "abc";
			var s2 = "abc";
			var s3 = new String("abc");
			var s4 = new String("abc");
			/**
			 * Q:
			 * s1==s2  true
			 * s3==s4  false
			 * s1==s3  true
			 * s1==s4  true
			 */
		</script>
	</body>
</html>
